Thunderstorm Wind, Valley
- When
- May 25, 4:27 AM CST
- Where
- Valley County
- Coordinates
- 48.200, -106.630
Tornadoes and Hail in Montana, May 25, 1991
3 tornado, 2 hail, 1 thunderstorm wind, as filed by the National Weather Service.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 6
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
Event by event
3 tornado, 2 hail, 1 thunderstorm wind. Local standard time, as filed.
Hail, Lewis and Clark
- When
- May 25, 8:30 PM CST
- Where
- Lewis and Clark County
- Measured
- 1 in hail
- Coordinates
- 46.580, -112.030
Tornado, Sheridan
- When
- May 25, 7:50 PM MST
- Where
- Sheridan County
- Rating
- F0
- Path length
- 0.2 mi
- Path width
- 10 yd
- Coordinates
- 48.600, -104.780
Tornado, Roosevelt
- When
- May 25, 8:00 PM MST
- Where
- Roosevelt County
- Rating
- F0
- Path length
- 0.2 mi
- Path width
- 10 yd
- Coordinates
- 48.130, -104.900
Tornado, Roosevelt
- When
- May 25, 8:00 PM MST
- Where
- Roosevelt County
- Rating
- F0
- Path length
- 0.2 mi
- Path width
- 10 yd
- Coordinates
- 48.550, -105.200
Hail, Powder River
- When
- May 25, 11:12 PM CST
- Where
- Powder River County
- Measured
- 1.75 in hail
- Coordinates
- 45.000, -105.480
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Tornado
- A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
More
Every storm in Montana in 1991Every state in 1991This day in weather historyThe tornado archive for Montana, 1991Warnings in Montana, May 1991
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 10071501, 10071505, 10071502, 10071503, 10071504, 10071506.